Mim process structure inner circle shaping inner support insert structure, shaping tool and shaping system

Abstract

The utility model relates to MIM process technical field, especially a kind of MIM process structure inner circle shaping inner support insert structure, shaping tool and shaping system. Wherein MIM process structure inner circle shaping inner support insert structure includes the inner support insert with first through-hole, and the inner support insert includes at least two inner support insert petals arranged along the circumference of first through-hole, and inner support insert petal can be radially moved and / or deformed along first through-hole. The MIM process structure inner circle shaping inner support insert structure of the application, by the shaping outer force radially outward along first through-hole that inner support insert petal exerts to MIM process structure inner circle, to reach the purpose of MIM process structure inner circle extrusion shaping, avoid the inner circle axial frictional motion of inner support insert petal and MIM process structure inner circle, thus avoid the probability of appearance defect such as strain, scratch after shaping MIM process structure inner circle, improve the appearance yield of MIM process structure inner circle shaping process, and then compared with the existing cylindrical straight support scheme, shaping cost is lower.

Description

Technical Field

[0001] This utility model relates to the field of MIM process technology, and in particular to a structure of an inner circle shaping inner support insert, shaping tooling and shaping system for MIM process. Background Technology

[0002] MIM (Metal Injection Molding) is an advanced manufacturing process that combines the design flexibility of plastic injection molding with the near-net-shape characteristics of powder metallurgy.

[0003] With the widespread application of consumer electronics, consumers' experience with smart products is gradually improving, and the dimensional accuracy of MIM (Metal Injection Molding) structures manufactured using MIM technology also needs to be improved. Since the MIM process involves high-temperature sintering, and some inner-circle MIM structures deform during sintering shrinkage, a shaping process is needed to correct the deformation and dimensional accuracy of the MIM structure.

[0004] Currently, the main solution to the above problems is the cylindrical direct support method: This method involves pushing a cylinder into the inner circle, similar to a pulling motion, to enlarge the inner circle. Due to the influence of friction, this method can cause scratches on the inner circle of the MIM (Metal Injection Molding) structure. The greater the deformation of the inner circle, the greater the scratches. Therefore, this method often requires additional post-processing of the inner circle (machining, polishing) to ensure the dimensional accuracy and appearance requirements of the inner circle of the machined MIM structure. This post-processing increases the machining cost of the inner circle of the MIM structure. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the existing cylindrical straight support scheme in the background technology, which can only solve the manufacturing of MIM process structures with an inner circle of one diameter. If different inner circles are encountered, the inner circle of the MIM process structure will be damaged, requiring subsequent inner circle post-processing, which increases the processing cost of the inner circle of the MIM process structure. This invention provides a structure of inner circle shaping support insert, shaping tooling and shaping system for MIM process structures.

[0006] In a first aspect, the present invention provides an inner support insert structure for inner circular shaping in MIM process, including an inner support insert having a first through hole, the inner support insert including at least two inner support insert petals arranged circumferentially along the first through hole, the inner support insert petals being capable of radial movement and / or deformation along the first through hole.

[0007] The present application describes a structure for an inner circle shaping insert in a MIM process structure. The inner support insert includes at least two inner support insert petals arranged circumferentially along the first through hole. During use, the inner circle of the MIM process structure is fitted onto the inner support insert. By moving and / or deforming the inner support insert petals radially outward along the first through hole, the inner support insert petals can apply a shaping force radially outward along the first through hole to the inner circle of the MIM process structure, thereby achieving the purpose of extruding and shaping the inner circle of the MIM process structure. This greatly reduces or even avoids the axial frictional movement between the inner support insert petals and the inner circle of the MIM process structure, thus greatly reducing or even avoiding the probability of appearance defects such as scratches and pulls on the inner circle of the MIM process structure after shaping. This improves the appearance yield of the inner circle shaping process of the MIM process structure, and thus the shaping cost is lower compared to the existing cylindrical direct support solution.

[0008] Preferably, the first through hole is surrounded by all the inner support insert petals.

[0009] Preferably, adjacent inner support insert segments can be spaced apart. This allows adjacent inner support insert segments to move relatively freely during radial movement and / or deformation along the first through hole.

[0010] Preferably, the inner support insert petal can only move and / or deform radially along the first through hole.

[0011] The inner circle shaping insert structure of the MIM process structure described in this application involves fitting the inner circle of the MIM process structure onto the inner support insert during use. The inner support insert petals can only move and / or deform radially outward along the first through hole, so that the inner support insert petals only apply a shaping force radially outward along the first through hole to the inner circle of the MIM process structure, thereby achieving the purpose of extruding and shaping the inner circle of the MIM process structure. In the above process, frictional movement between the inner support insert petals and the inner circle of the MIM process structure along the inner circle axis is avoided. Therefore, it effectively avoids appearance defects such as tearing and scratches on the inner circle of the MIM process structure after shaping, improves the appearance yield of the inner circle shaping process of the MIM process structure, and thus has a lower shaping cost compared with the existing cylindrical direct support solution.

[0012] When installing and / or removing the inner circle of the MIM process structure, the inner support insert petals move and / or deform only radially inward along the first through hole to achieve the purpose of quick installation or quick removal.

[0013] Preferably, the inner support insert petal can only reciprocate radially along the first through hole. This achieves the purpose of the inner support insert petal applying a shaping force radially outward along the first through hole to the inner circle of the MIM process structure, as well as the purpose of rapid installation or rapid disassembly.

[0014] Preferably, the inner support insert petal can only elastically deform radially along the first through hole. This achieves the purpose of the inner support insert petal applying a shaping force radially outward along the first through hole to the inner circle of the MIM process structure, as well as the purpose of rapid installation or rapid disassembly.

[0015] Preferably, the inner support insert petal can only reciprocate and elastically deform radially along the first through hole. This achieves the purpose of the inner support insert petal applying a shaping force radially outward along the first through hole to the inner circle of the MIM process structure, as well as the purpose of rapid installation or rapid disassembly.

[0016] Preferably, the inner support insert includes two inner support insert petals, which are arranged opposite to each other. Compared to having at least three inner support insert petals, the inner support insert having two oppositely arranged inner support insert petals creates a semi-open structure. This not only provides a guiding function, enabling precise compression of the target position, but also allows the clearance between the two semi-circular inner support insert petals to be adjusted according to the amount of inner circle deformation in the MIM process, thus accommodating the shaping of inner circle parts with greater deformation.

[0017] Preferably, the minimum spacing between the two inner support inserts is greater than or equal to the maximum deformation of the inner circle of the MIM process structure, so as to achieve the purpose of the inner support inserts adapting to all inner circle deformations of the MIM process structure, and to avoid the situation where the same MIM process structure cannot be placed for shaping due to large inner circle deformation.

[0018] Preferably, adjacent inner support insert petals are not connected.

[0019] Preferably, there is a flexible connection between adjacent inner support insert petals.

[0020] The shaping fixture described in this application has adjacent inner support inserts that are not connected or are flexibly connected, thereby allowing the inner support inserts to move relatively freely with other inner support inserts in the radial direction of the first through hole. This effectively ensures that all inner support inserts can move in the radial direction of the first through hole, effectively reducing or even avoiding the axial frictional movement between the inner support inserts and the inner circle of the MIM process structure. Therefore, it greatly reduces the probability of defects such as scratches and pulls on the inner circle of the MIM process structure after shaping, and improves the appearance yield of the inner circle of the MIM process structure.

[0021] Preferably, the outer side of the inner support insert has at least two cylindrical outer support surfaces of different diameters along the opening direction of the first through hole.

[0022] The inner support insert structure for inner circle shaping in the MIM process structure described in this application allows the inner support insert to move and / or deform radially along the first through hole to solve the problem of inner circle deformation in the MIM process structure. In addition, the outer surface of the inner support insert has at least two cylindrical outer support surfaces of different diameters along the opening direction of the first through hole. Therefore, the inner support insert can be used for shaping MIM process structures with inner circles of at least two different diameters, thus making the inner support insert structure for inner circle shaping in the MIM process structure more widely applicable.

[0023] Preferably, a first step is provided between adjacent cylindrical outer support surfaces.

[0024] In a second aspect, this utility model provides a shaping fixture, including an inner circular shaping inner support insert structure as described in this application for the MIM process, wherein: The outer wall of the core-pulling insert has a first guide surface whose diameter gradually changes along the opening direction, and the inner wall of the inner support insert petal is provided with a second guide surface that matches the first guide surface; after one end of the core-pulling insert extends into the first through hole, it can move along the opening direction of the first through hole to drive the first guide surface and the second guide surface to press and cooperate. or, The core-pulling insert has a first guide surface whose diameter gradually changes along the opening direction on its outer wall. The first through hole is set with a constant diameter. After one end of the core-pulling insert is inserted into the first through hole, it can move along the opening direction of the first through hole to drive the first guide surface to press and cooperate with the inner wall of the first through hole. or, The outer wall of the core-pulling insert has a cylindrical surface, and the inner wall of the inner support insert petal is provided with a second guide surface. After one end of the core-pulling insert extends into the first through hole, it can move along the opening direction of the first through hole to drive the cylindrical surface to press and cooperate with the second guide surface.

[0025] The shaping fixture described in this application allows one end of the core-pulling insert to extend into a first through hole and move along the opening direction of the first through hole. This causes the first guide surface and the second guide surface to press against each other, allowing the core-pulling insert to transmit external force to the inner support insert petal through the mating surface of the first guide surface and the second guide surface. This achieves the purpose of radial movement and / or deformation of the inner support insert petal along the first through hole. Furthermore, the inner support insert petal applies a shaping force radially outward along the first through hole only to the inner circle of the MIM process structure, achieving the purpose of extruding and shaping the inner circle of the MIM process structure. In the above process, frictional movement between the inner support insert petal and the inner circle of the MIM process structure along the inner circle axis is avoided. Therefore, it effectively avoids appearance defects such as tearing and scratches on the inner circle of the MIM process structure after shaping, improves the appearance yield of the inner circle shaping process of the MIM process structure, and thus has a lower shaping cost compared with the existing cylindrical direct support solution.

[0026] The shaping fixture described in this application allows one end of the core-pulling insert to extend into a first through hole and move along the opening direction of the first through hole. This causes the first guide surface to press against the inner wall of the first through hole, allowing the core-pulling insert to transfer external force to the inner support insert petal. This achieves the purpose of the inner support insert petal moving radially and / or deforming along the first through hole. Furthermore, the inner support insert petal applies a shaping force radially outward along the first through hole only to the inner circle of the MIM process structure, achieving the purpose of extruding and shaping the inner circle of the MIM process structure. In the above process, frictional movement between the inner support insert petal and the inner circle of the MIM process structure along the inner circle axis is avoided. Therefore, it effectively avoids appearance defects such as tearing and scratches on the inner circle of the MIM process structure after shaping, improves the appearance yield of the inner circle shaping process of the MIM process structure, and thus has a lower shaping cost compared to the existing cylindrical direct support solution.

[0027] The shaping fixture described in this application allows one end of the core-pulling insert to extend into the first through hole and move along the opening direction of the first through hole, thereby causing the cylindrical surface and the second guide surface to press against each other. This allows the core-pulling insert to transmit external force to the inner support insert petal, achieving the purpose of radial movement and / or deformation of the inner support insert petal along the first through hole. Furthermore, the inner support insert petal applies a shaping force radially outward along the first through hole only to the inner circle of the MIM process structure, achieving the purpose of extruding and shaping the inner circle of the MIM process structure. In the above process, frictional movement between the inner support insert petal and the inner circle of the MIM process structure along the inner circle axis is avoided. Therefore, it effectively avoids appearance defects such as tearing and scratches on the inner circle of the MIM process structure after shaping, improves the appearance yield of the inner circle shaping process of the MIM process structure, and thus has a lower shaping cost compared to the existing cylindrical direct support solution.

[0028] Preferably, the first guide surface is a conical surface.

[0029] Preferably, the end face of the core-pulling insert near the inner support insert has a chamfer or rounding between it and the first guide surface. This facilitates the entry of the end of the core-pulling insert into the first through hole.

[0030] Preferably, the core-pulling insert has at least two first guide surfaces of different diameters along the opening direction of the first through hole; and a second step portion is provided between adjacent first guide surfaces.

[0031] In a third aspect, this utility model provides a shaping system, including an upper mold base, a lower mold base, and a shaping fixture as described in this application. The core-pulling insert is installed on the upper mold base, and the inner support insert is installed on the lower mold base. The core-pulling insert is correspondingly disposed to the first through hole. The upper mold base and the lower mold base can move relative to each other along the opening direction of the first through hole to drive the core-pulling insert to cooperate with the first through hole.

[0032] The shaping system described in this application utilizes the relative movement of the upper mold base and the lower mold base to drive the core-pulling insert into the first through hole, and to move and / or deform the inner support insert radially along the first through hole, so as to achieve the purpose of solving the inner circle deformation of the MIM process structure.

[0033] Preferably, the outer side of the inner support insert is provided with a shaping position, and there is a space between the shaping position and the inner support insert for placing the inner circle of the MIM process structure.

[0034] Compared with the prior art, the beneficial effects of this utility model are as follows: The present application describes a structure for an inner circle shaping insert in a MIM process structure. The inner support insert includes at least two inner support insert petals arranged circumferentially along the first through hole. During use, the inner circle of the MIM process structure is fitted onto the inner support insert. By moving and / or deforming the inner support insert petals radially outward along the first through hole, the inner support insert petals apply a shaping force radially outward along the first through hole to the inner circle of the MIM process structure, thereby achieving the purpose of extruding and shaping the inner circle of the MIM process structure. This greatly reduces or even avoids the axial frictional movement between the inner support insert petals and the inner circle of the MIM process structure, thus greatly reducing or even avoiding the probability of scratches, pulls, or other appearance defects on the inner circle of the MIM process structure after shaping. This improves the appearance yield of the inner circle shaping process of the MIM process structure, and further reduces the shaping cost compared to the existing cylindrical direct support solution. Attached Figure Description

[0035] Figure 1 This is a longitudinal sectional view of the inner support insert of this application.

[0036] Figure 2 This is a schematic diagram of the internal support insert of this application.

[0037] Figure 3 This is a longitudinal cross-sectional schematic diagram showing the cooperation between the inner support insert and the core-pulling insert in this application.

[0038] Figure 4 This is a longitudinal section exploded view of the inner support insert and the core-pulling insert of this application.

[0039] Figure 5 As an appendix to this application Figure 4 Enlarged schematic diagram of section A in the middle.

[0040] Figure 6 This is a schematic diagram showing the location of the second step portion on the core-pulling insert of this application.

[0041] Figure 7 This is a three-dimensional schematic diagram of a core-pulling insert in a shaping system according to this application before it extends into an inner support insert.

[0042] Figure 8 This is a schematic diagram of the structure of a shaping system according to this application.

[0043] Marked in the image: In the diagram: 1-Upper mold base; 2-Upper template; 3-Shovel; 4-Shaping slide; 5-Slide seat; 6-Guide pillar; 7-Lower template; 8-Lower mold base; 9-Upper mold insert; 10-Core-pulling insert; 11-Inner support insert petal; 12-Lower mold insert; 13-First guide surface; 14-Chamfer; 15-Guide rounded corner surface; 16-Second guide surface; 17-First through hole; 18-First step; 19-Cylindrical outer support surface; 20-Inner support insert; 22-Second step. Detailed Implementation

[0044] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0045] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0046] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0047] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0048] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0049] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0050] Example 1 like Figure 1 and Figure 2 As shown, this embodiment provides an inner support insert structure for inner circular shaping in MIM process, including an inner support insert 20 with a first through hole 17. The inner support insert 20 includes at least two inner support insert petals 11 arranged circumferentially along the first through hole 17. The inner support insert petals 11 are capable of radial movement and / or deformation along the first through hole 17.

[0051] More preferably, the inner support insert petal described in the above scheme can move and / or deform radially along the first through hole, which preferably includes two cases: the inner support insert petal moves and / or deforms radially outward along the first through hole, and the inner support insert petal moves and / or deforms radially inward along the first through hole. Generally, when installing and / or disassembling the inner circle of the MIM process structure, the inner support insert petal moves and / or deforms radially inward along the first through hole to achieve the purpose of quick installation or quick disassembly; when in use, the inner support insert petal moves and / or deforms radially outward along the first through hole to achieve the purpose of extrusion shaping of the inner circle of the MIM process structure.

[0052] In the above scheme, elastic deformation is preferred.

[0053] In the above scheme, more preferably, the first through hole 17 provided on the inner support insert 20 is surrounded by all the inner support insert petals 11.

[0054] In one or more embodiments, adjacent inner support insert petals 11 are spaced apart. This allows adjacent inner support insert petals 11 to be relatively free during radial movement and / or deformation along the first through hole 17.

[0055] In one or more embodiments, the inner support insert 11 can only move and / or deform radially along the first through hole 17. During use, the inner circle of the MIM process structure is fitted onto the inner support insert 20. The inner support insert 11 can only move and / or deform radially along the first through hole 17, so that the inner support insert 11 only applies a shaping force radially outward along the first through hole 17 to the inner circle of the MIM process structure, achieving the purpose of extruding and shaping the inner circle of the MIM process structure. In this process, frictional movement along the inner circle axis between the inner support insert 11 and the inner circle of the MIM process structure is avoided. Therefore, it effectively avoids defects such as scratches and pulls on the inner circle of the MIM process structure after shaping, improving the appearance yield of the inner circle shaping process. Furthermore, compared to existing cylindrical direct support solutions, the shaping cost is lower.

[0056] The inner support insert 11 moves and / or deforms radially along the first through hole 17, preferably including one of the following three cases.

[0057] Preferred method 1: The inner support insert 11 can reciprocate radially along the first through hole 17. During the outward movement, the inner support insert 11 can apply a shaping force radially outward along the first through hole 17 to the inner circle of the MIM process structure; during the inward movement, it can achieve the purpose of quick installation or quick disassembly.

[0058] Preferred method two: The inner support insert 11 can be elastically deformed radially along the first through hole 17. During the outward movement, the inner support insert 11 can apply a shaping force radially outward along the first through hole 17 to the inner circle of the MIM process structure; during the inward deformation, it can achieve the purpose of quick installation or quick disassembly.

[0059] Preferably, in the third method: the inner support insert 11 can move radially outward and elastically deform outward along the first through hole 17. During the outward movement and elastic deformation, the inner support insert 11 can apply a shaping force radially outward along the first through hole 17 to the inner circle of the MIM process structure; during the inward movement and elastic deformation, it can achieve the purpose of rapid installation or rapid disassembly.

[0060] In one or more embodiments, the inner support insert 20 includes two inner support insert petals 11, which can be two or at least three. However, when there are two, the two inner support insert petals 11 are arranged opposite to each other. Compared to having at least three inner support insert petals 11, the inner support insert 20 includes two oppositely arranged inner support insert petals 11, making the inner support insert 20 a half-open structure. This not only has a guiding function, enabling precise compression of the target position, but also allows the clearance between the two semi-circular inner support insert petals 11 to be adjusted according to the inner circle deformation amount of the MIM process structure, thus accommodating the shaping of inner circle parts with greater deformation.

[0061] In one or more embodiments, the minimum distance between the two inner support insert petals 11 is greater than or equal to the maximum deformation of the inner circle of the MIM process structure, so as to achieve the purpose of the inner support insert petals 11 adapting to all inner circle deformations of the MIM process structure, and avoid the situation where the same MIM process structure cannot be placed for shaping due to large inner circle deformation.

[0062] The adjacent inner support inserts 11 are relatively free, preferably including one of the following three cases: Preferred method 1: Adjacent inner support insert petals 11 are not connected.

[0063] Preferred method 2: Flexible connection between adjacent inner support insert petals 11.

[0064] In one or more embodiments, the outer surface of the inner support insert 20 has at least two cylindrical outer support surfaces 19 of different diameters along the opening direction of the first through hole 17. Since the inner support insert 20 can move and / or deform radially along the first through hole 17 to solve the problem of inner circle deformation in the MIM process structure, and given that the outer surface of the inner support insert 20 has at least two cylindrical outer support surfaces 19 of different diameters along the opening direction of the first through hole 17, the inner support insert 20 can be used for shaping MIM process structures with at least two different inner circle diameters, thus making the inner circle shaping inner support insert structure of the MIM process structure more widely applicable.

[0065] More preferably, a first step portion 18 is provided between adjacent cylindrical outer support surfaces 19. By having at least one first step portion 18 on the outer side of the inner support insert 20 along the opening direction of the first through hole 17, it is possible to accommodate the inner circle of the MIM process structure with at least two different hole diameters, making the shaping fixture described in this embodiment more adaptable.

[0066] This embodiment describes a structure for shaping the inner circle of a MIM process structure using an inner support insert. The inner support insert 20 includes at least two inner support insert petals 11 arranged circumferentially along the first through hole 17. During use, the inner circle of the MIM process structure is fitted onto the inner support insert 20. By moving and / or deforming the inner support insert petals 11 radially along the first through hole 17, the inner support insert petals 11 apply a shaping force radially outward along the first through hole 17 to the inner circle of the MIM process structure, thereby achieving the purpose of extruding and shaping the inner circle of the MIM process structure. This greatly reduces or even avoids the axial frictional movement between the inner support insert petals 11 and the inner circle of the MIM process structure. Therefore, it greatly reduces or even avoids the probability of defects such as tearing and scratches on the inner circle of the MIM process structure after shaping, improves the appearance yield of the inner circle shaping process of the MIM process structure, and thus has a lower shaping cost compared to the existing cylindrical direct support scheme.

[0067] Currently, there is a technical solution in this field to address the deformation and dimensional accuracy of MIM process structures by using an internal expansion sleeve: specifically, this involves fabricating an elastic internal expansion sleeve and a cylindrical internal support core. The expansion sleeve is enlarged by the internal support core, and the inner circle enlarges synchronously with the expansion sleeve. Due to the special structure of the expansion sleeve, the inner circle needs to be large enough, with an estimated diameter ≥15mm, and the space for the expansion sleeve to enlarge is relatively small, with an estimated diameter deformation ≤0.2mm. This solution can only be used to shape inner circles with small deformations; for inner circles with large deformations, there may be problems such as the sleeve not fitting in or not being able to reach the required inner circle diameter.

[0068] The inner circle shaping inner support insert structure of the MIM process structure described in this embodiment can adapt to inner circles with larger deformations. At the same time, one end of the expansion sleeve of the inner support sleeve must be fixed, so it can only rotate outward around the fixed end to achieve the purpose of outward deformation, which will have a large probability of inner circle tearing. In contrast, the inner circle shaping inner support insert structure of the MIM process structure described in this embodiment of the present application greatly reduces or even avoids the probability of tearing, scratches and other appearance defects in the inner circle of the MIM process structure after shaping, compared with the inner support expansion sleeve solution. Moreover, since the inner support insert petal 11 can move and / or deform radially along the first through hole 17, the shaping effect is also better.

[0069] Example 2 like Figures 1-6 As shown, this embodiment discloses a shaping fixture, including an inner circle shaping inner support insert structure as described in Embodiment 1, and also includes a core-pulling insert 10.

[0070] In one or more embodiments, the outer wall of the core-pulling insert 10 has a first guide surface 13 whose diameter gradually changes along the opening direction, and the inner wall of the inner support insert 11 is provided with a second guide surface 16 that matches the first guide surface 13. Under the action of the opposing inclined surfaces, the inner support insert 20 expands outward synchronously, resulting in a better shaping effect.

[0071] In one or more embodiments, after one end of the core-pulling insert 10 extends into the first through hole 17, it can move along the opening direction of the first through hole 17 to drive the first guide surface 13 to press and engage with the second guide surface 16.

[0072] The shaping fixture described in this embodiment extends one end of the core-pulling insert 10 into the first through hole 17 and moves it along the opening direction of the first through hole 17, thereby causing the first guide surface 13 and the second guide surface 16 to press against each other. This allows the core-pulling insert 10 to transmit external force to the inner support insert petal 11 through the mating surface of the first guide surface 13 and the second guide surface 16, so as to achieve the purpose of radial movement and / or deformation of the inner support insert petal 11 along the first through hole 17. Furthermore, the inner support insert petal 11 applies a shaping force radially outward along the first through hole 17 only to the inner circle of the MIM process structure, so as to achieve the purpose of extrusion shaping of the inner circle of the MIM process structure. In the above process, frictional movement between the inner support insert petal 11 and the inner circle of the MIM process structure along the inner circle axis is avoided. Therefore, it effectively avoids the appearance defects such as tearing and scratches on the inner circle of the MIM process structure after shaping, improves the appearance yield of the inner circle shaping process of the MIM process structure, and thus has a lower shaping cost compared with the existing cylindrical direct support solution.

[0073] In some other preferred embodiments, the core-pulling insert 10 has a first guide surface 13 whose diameter gradually changes along the opening direction on its outer wall, and the first through hole 17 is provided with a constant diameter. After one end of the core-pulling insert 10 extends into the first through hole 17, it can move along the opening direction of the first through hole 17 to drive the first guide surface 13 to press and cooperate with the inner wall of the first through hole 17.

[0074] The shaping fixture described in this embodiment allows one end of the core-pulling insert 10 to extend into the first through hole 17 and move along the opening direction of the first through hole 17. This causes the first guide surface 13 to press against the inner wall of the first through hole 17, allowing the core-pulling insert 10 to transmit external force to the inner support insert petal 11. This achieves the purpose of radial movement and / or deformation of the inner support insert petal 11 along the first through hole 17. Furthermore, the inner support insert petal 11 applies a shaping force radially outward along the first through hole 17 only to the inner circle of the MIM process structure, achieving the purpose of extruding and shaping the inner circle of the MIM process structure. In the above process, frictional movement between the inner support insert petal 11 and the inner circle of the MIM process structure along the inner circle axis is avoided. Therefore, it effectively avoids appearance defects such as tearing and scratches on the inner circle of the MIM process structure after shaping, improves the appearance yield of the inner circle shaping process of the MIM process structure, and thus has a lower shaping cost compared to the existing cylindrical direct support solution.

[0075] In some other preferred embodiments, the outer wall of the core-pulling insert 10 has a cylindrical surface, and the inner wall of the inner support insert petal 11 is provided with a second guide surface 16. After one end of the core-pulling insert 10 extends into the first through hole 17, it can move along the opening direction of the first through hole 17 to drive the cylindrical surface to press and cooperate with the second guide surface 16.

[0076] The shaping fixture described in this embodiment allows one end of the core-pulling insert 10 to extend into the first through hole 17 and move along the opening direction of the first through hole 17, thereby causing the cylindrical surface to press against the second guide surface 16. This allows the core-pulling insert 10 to transmit external force to the inner support insert petal 11, achieving the purpose of radial movement and / or deformation of the inner support insert petal 11 along the first through hole 17. Furthermore, the inner support insert petal 11 applies a shaping force radially outward along the first through hole 17 only to the inner circle of the MIM process structure, achieving the purpose of extruding and shaping the inner circle of the MIM process structure. In the above process, frictional movement between the inner support insert petal 11 and the inner circle of the MIM process structure along the inner circle axis is avoided. Therefore, it effectively avoids appearance defects such as tearing and scratches on the inner circle of the MIM process structure after shaping, improves the appearance yield of the inner circle shaping process of the MIM process structure, and thus has a lower shaping cost compared to the existing cylindrical direct support solution.

[0077] In one or more embodiments, the first guide surface 13 is a conical surface.

[0078] In one or more embodiments, the end face of the core-pulling insert 10 near the inner support insert 20 is provided with a chamfer 14 or a rounding between it and the first guide surface 13. This facilitates the entry of the end of the core-pulling insert 10 into the first through hole 17.

[0079] In one or more embodiments, the core-pulling insert 10 has at least two first guide surfaces 13 of different diameters along the opening direction of the first through hole 17; a second step portion 22 is provided between adjacent first guide surfaces 13. This allows the wall thickness of the inner support insert petal 11 to be controlled even when the outer side of the inner support insert 20 has at least two cylindrical outer support surfaces 19 of different diameters along the opening direction of the first through hole 17, thus enabling better control of the deformation of the inner support insert petal 11.

[0080] More preferably, the diameter of the first guide surface 13 is smaller the closer it is to the core-pulling insert 10.

[0081] The existing technology still has the following problems: 1. Internal Support Expansion Sleeve Solution: This solution involves creating an elastic internal support expansion sleeve and a cylindrical internal support core. The internal support core expands the expansion sleeve, and the inner circle expands synchronously with the expansion sleeve. Due to the special structure of the expansion sleeve, the inner circle needs to be large enough (estimated diameter ≥ 15mm), and the space for the expansion sleeve to expand is relatively small (estimated diameter deformation ≤ 0.2mm). This solution can only be used for inner circles with small deformations. For inner circles with large deformations, there may be problems such as the sleeve not fitting or not being able to reach the required inner circle diameter.

[0082] 2. Cylindrical Direct Support Solution: The cylinder is pushed into the inner circle, similar to a pulling motion, to enlarge the inner circle. Due to the influence of friction, the inner circle will be scratched in this solution. The greater the deformation of the inner circle, the greater the scratching will be. Therefore, this solution often requires additional post-processing of the inner circle, such as machining and polishing, to ensure dimensional accuracy and appearance requirements, thus increasing the manufacturing process and cost.

[0083] To address the aforementioned issues, in one or more embodiments, the shaping fixture described in this embodiment includes at least two inner support insert petals 11 spaced circumferentially along the core-pulling insert 10, with adjacent inner support insert petals 11 not connected. This allows the inner support insert petals 11 to move radially relative to other inner support insert petals 11 within the first through hole 17, effectively ensuring that all inner support insert petals 11 can move radially within the first through hole 17. This effectively reduces or even eliminates axial frictional movement between the inner support insert petals 11 and the inner circle of the MIM process structure, thus significantly reducing the probability of scratches, pulls, or other appearance defects on the inner circle of the MIM process structure after shaping, and improving the appearance yield of the inner circle of the MIM process structure.

[0084] A further preferred method is as follows: the inner support insert 11 is a two-semicircle structure with a certain gap between the semicircles. This gap can be adjusted according to the deformation of the inner circle during the mass production of the MIM process, with the maximum deformation of the inner circle as the minimum gap value. This ensures that the inner support insert 11 can adapt to all MIM process structures with varying inner circle deformation, avoiding situations where the inner circle of the same MIM process structure with large deformation cannot be placed for shaping.

[0085] In this embodiment, the core-pulling insert 10 is also called the inner-support cylindrical core-pulling insert.

[0086] In summary, the shaping fixture described in this embodiment also has the following advantages: The internal support insert 11 is simpler to process than the existing expansion sleeve solution, and the manufacturing cost of the shaping tooling is reduced by 5-10%; The inner support insert 11 has no axial frictional movement with the inner circle of the MIM process structure, thus avoiding appearance defects such as tearing and scratches on the inner circle sidewall after shaping; The inner support insert 11 has a split structure, and the clearance between the two semicircles can be adjusted according to the deformation of the inner circle. Theoretically, it is applicable to the inner circle MIM process structure shaping for all deformation amounts.

[0087] The inner support insert 20 and the core-pulling insert 10 together form an upper and lower interlocking structure. As part of the forming mold core, it changes the way the forming mold core transmits pressure to the inner circle of the MIM process structure, thereby achieving a better effect in adjusting the dimensional accuracy of the inner circle.

[0088] Example 3 like Figures 1-8 As shown, this embodiment discloses a shaping system, including an upper mold base 1, a lower mold base 8, and a shaping fixture as described in Embodiment 2. The core-pulling insert 10 is installed on the upper mold base 1, and the inner support insert 20 is installed on the lower mold base 8. The core-pulling insert 10 is correspondingly disposed with the first through hole 17. The upper mold base 1 and the lower mold base 8 can move relative to each other along the opening direction of the first through hole 17 to drive the core-pulling insert 10 to cooperate with the first through hole 17.

[0089] In one or more embodiments, a shaping position 4 is provided on the outer side of the inner support insert 20, and there is a space between the shaping position 4 and the inner support insert 20 for placing the inner circle of the MIM process structure.

[0090] In one or more embodiments, a scraper 3 is provided on the upper mold base 1. The scraper 3 is located outside the core-pulling insert 10. The shaping slide 4 is installed on the slide seat 5. The slide seat 5 is configured such that when the scraper 3 presses the slide seat 5 along the opening direction of the first through hole 17, the slide seat 5 drives the shaping slide 4 to move toward the inner support insert 20.

[0091] Further specific optimization of the solution: This embodiment provides a shaping system, including an upper mold base 1 and a corresponding matching lower mold base 8. An upper template 2 is provided on the upper mold base 1, and a lower template 7 is provided on the lower mold base 8. The upper template 2 is correspondingly matched with the lower template 7. An upper mold insert 9 is provided on the upper template 2, and a scraper 3 is installed on the side ends around the upper mold insert 9. A core-pulling insert 10 is provided at the lower end of the upper mold insert 9. A lower mold insert 12 is provided at the upper end of the lower template 7, and a shaping slide 4 is installed on the side ends around the lower mold insert 12. The shaping slide 4 is installed on the upper end of the lower template 7 through a slide seat 5. An inner support insert 20 is installed on the lower mold insert 12, and the inner support insert 20 is fitted onto the lower end of the vertically arranged core-pulling insert 10.

[0092] The upper mold insert 9 is preferably rectangular; the upper mold insert 9 is preferably located at the lower end of the upper mold plate 2.

[0093] The core-pulling insert 10 is preferably conical in shape.

[0094] The lower mold insert 12 is preferably rectangular.

[0095] The inner support insert 20 preferably includes two semi-circular inner support insert petals 11.

[0096] This embodiment provides a shaping system. A shaping slide 4 is installed on the sides of the lower mold insert 12. The shaping slide 4 is mounted on the upper end of the lower template 7 via a slide seat 5. During mold closing, the shaping slide 4 presses against the outer periphery of the inner circle of the MIM process structure under the alignment action of the fork 3 and the slide seat 5, preventing deformation of the outer periphery of the inner circle of the MIM process structure. Two semi-circular inner support insert petals 11 are installed on the upper end of the lower mold insert 12, and the inner support insert petals 11 are fitted onto the lower end of a vertically arranged core-pulling insert 10. The lower end of the core-pulling insert 10 is provided with a conical guide head. During mold closing, the core-pulling insert 10 acts on the inner support insert petals 11, causing the two semi-circular inner support insert petals 11 to open outwards, thereby shaping the inner circle of the MIM process structure. This effectively solves the problems of deformation and dimensional deviation of the inner circle of the MIM process structure, ensuring the size and appearance of the inner circle of the MIM process structure and improving the yield of the inner circle of the MIM process structure.

[0097] like Figure 7 and Figure 8As shown, the shaping fixture described in this embodiment includes an upper mold base 1 and a corresponding matching lower mold base 8, as well as an upper template 2 and a corresponding matching lower template 7. The upper template 2 is provided with a rectangular upper mold insert 9 at its upper end, and a scraper 3 is installed on the side ends around the upper mold insert 9. The upper mold insert 9 has a conical core-pulling insert 10 at its end. The upper template 2 is installed on the upper end of the lower template 7 through vertically arranged guide posts. The lower end face of the upper template 2 is provided with a scraper 3 corresponding to and matching the slide seat 5. The lower template 7 is provided with a rectangular lower mold insert 12 at its upper end, and a shaping slide 4 is installed on the side ends around the lower mold insert 12. The shaping slide 4 is installed on the upper end of the lower template 7 through the slide seat 5. The lower mold insert 12 is provided with two semi-circular inner support insert petals 11, and the inner support insert petals 11 are fitted onto the lower end of the vertically arranged core-pulling insert 10.

[0098] When the mold is closed, the slide seat 5 and the corresponding shaping slide 4 form a whole with the lower template 7 through the sliding engagement of the track. Under the squeezing action of the inclined surface of the shovel 3 on the inclined surface of the slide seat 5, at least two shaping slides 4 slide toward the MIM process structure to press the outer periphery of the inner circle of the MIM process structure and prevent the outer periphery of the inner circle of the MIM process structure from deforming.

[0099] The upper mold insert 9 has a conical core-pulling insert 10 at one end, and the core-pulling insert 10 has a first guide surface 13; the lower mold insert 12 is equipped with two semi-circular inner support insert petals 11, and the opening of the inner support insert petals 11 is provided with a guide rounded corner surface 15. When the mold is closed, the guide surface guides the core-pulling insert 10 to align with the inner support insert petals 11, avoiding misalignment that could damage the insert during mold pressing.

[0100] The upper mold insert 9 has a cone-shaped core-pulling insert 10 at one end, and the core-pulling insert 10 has a first guide surface 13; the lower mold insert 12 is equipped with two semi-circular inner support insert petals 11, and the opening of the inner support insert petals 11 is provided with a guide surface 16.

[0101] During mold closing, ① under the action of the opposing inclined surfaces, the two semi-circular inner support insert petals 11 expand outwards simultaneously, thereby effectively solving problems such as deformation of inner circular holes, dimensional deviations, and poor appearance in the MIM process, and improving the yield of inner circular structures in the MIM process; ② under the action of the opposing inclined surfaces, the friction between the core-pulling insert 10 and the inner support insert petals 11 is reduced, as well as the local deformation of the inner support insert petals 11, thereby improving the service life of the core-pulling insert 10 and the inner support insert 20.

[0102] The inner support insert 11 has a two-semicircular structure with a certain gap between them. ① This gap can be adjusted according to the deformation of the inner circle during mass production of the MIM process [with the maximum deformation of the inner circle as the minimum gap value], so that the inner support insert 11 can adapt to all MIM process structures with varying inner circle deformation, avoiding the inability to fit the same MIM process structure with large inner circle deformation into the mold. ② After molding, mold closing, pressure holding, and mold opening, due to the gap between the two semicircles of the inner support insert 11, there is no risk of the inner circle of the MIM process structure seizing up with the inner support insert 11, making the MIM process structure easier to remove after molding.

[0103] The shaping system described in this embodiment is particularly suitable for materials in the MIM process that do not require heat treatment and have a hardness lower than HV300.

[0104] This embodiment discloses a shaping system with a simpler structure. Compared with the existing structure, it eliminates the stripper plate and delayed reset mechanism. Furthermore, the inner support insert 11 is simpler to process than the existing expansion sleeve solution, and the manufacturing cost of the shaping tooling is reduced by 5-10%. The shaping system described in this embodiment utilizes the relative movement of the upper mold base and the lower mold base to drive the core-pulling insert into the first through hole, and to move and / or deform the inner support insert radially along the first through hole, so as to achieve the purpose of solving the inner circle deformation of the MIM process structure.

[0105] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. The inner circular shaping and inner support insert structure of the MIM process is characterized by: It includes an inner support insert (20) having a first through hole (17), the inner support insert (20) including at least two inner support insert petals (11) arranged circumferentially along the first through hole (17), the inner support insert petals (11) being capable of radial movement and / or deformation along the first through hole (17).

2. The inner circular shaping and inner support insert structure of the MIM process structure according to claim 1, characterized in that: The first through hole (17) is surrounded by all the inner support insert petals (11); And / or, The inner support insert (11) can only move and / or deform radially along the first through hole (17); And / or, Adjacent inner support inserts (11) can be spaced apart.

3. The inner circular shaping and inner support insert structure of the MIM process structure according to claim 1 or 2, characterized in that: The inner support insert (11) can only reciprocate radially and / or elastically deform along the first through hole (17).

4. The inner circular shaping and inner support insert structure of the MIM process structure according to claim 3, characterized in that: The inner support insert (20) includes two inner support insert petals (11) arranged opposite to each other; The minimum spacing between the two inner support inserts (11) is greater than or equal to the maximum deformation of the inner circle of the MIM process structure.

5. The inner circular shaping and inner support insert structure of the MIM process structure according to claim 4, characterized in that: Adjacent inner support insert petals (11) are not connected; or, Flexible connection between adjacent inner support insert petals (11).

6. The inner circular shaping inner support insert structure of the MIM process structure according to claim 1 or 2, characterized in that: The outer side of the inner support insert (20) has at least two cylindrical outer support surfaces (19) of different diameters along the opening direction of the first through hole (17); there is a first step portion (18) between adjacent cylindrical outer support surfaces (19).

7. A shaping fixture, characterized in that: Includes a core-pulling insert (10) and an inner circular shaping inner support insert structure for MIM process as described in any one of claims 1-6, wherein: The outer wall of the core-pulling insert (10) has a first guide surface (13) whose diameter gradually changes along the opening direction, and the inner wall of the inner support insert (11) is provided with a second guide surface (16) that is adapted to the first guide surface (13); after one end of the core-pulling insert (10) extends into the first through hole (17), it can move along the opening direction of the first through hole (17) to drive the first guide surface (13) and the second guide surface (16) to press and cooperate; or, The core-pulling insert (10) has a first guide surface (13) whose diameter gradually changes along the opening direction on its outer wall. The first through hole (17) is set with a constant diameter. After one end of the core-pulling insert (10) extends into the first through hole (17), it can move along the opening direction of the first through hole (17) to drive the first guide surface (13) to press and cooperate with the inner wall of the first through hole (17). or, The outer wall of the core-pulling insert (10) has a cylindrical surface, and the inner wall of the inner support insert (11) is provided with a second guide surface (16). After one end of the core-pulling insert (10) extends into the first through hole (17), it can move along the opening direction of the first through hole (17) to drive the cylindrical surface to press and cooperate with the second guide surface (16).

8. The shaping fixture according to claim 7, characterized in that: The first guide surface (13) is a conical surface; And / or, The end face of the core-pulling insert (10) near the inner support insert (20) is provided with a chamfer (14) or a rounding between it and the first guide surface (13).

9. The shaping fixture according to claim 7, characterized in that: The core-pulling insert (10) has at least two first guide surfaces (13) of different diameters along the opening direction of the first through hole (17); there is a second step portion (22) between adjacent first guide surfaces (13).

10. A shaping system, characterized in that: The assembly includes an upper mold base (1), a lower mold base (8), and a shaping fixture as described in any one of claims 7-9. The core-pulling insert (10) is mounted on the upper mold base (1), and the inner support insert (20) is mounted on the lower mold base (8). The core-pulling insert (10) is correspondingly arranged with the first through hole (17). The upper mold base (1) and the lower mold base (8) can move relative to each other along the opening direction of the first through hole (17) to drive the core-pulling insert (10) to cooperate with the first through hole (17). The inner support insert (20) has a shaping position (4) on its outer side, and there is a space between the shaping position (4) and the inner support insert (20) for placing the inner circle of the MIM process structure.

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